package com.loto.insurance.oem.web.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.loto.insurance.oem.web.entity.ajax.BaseJson;

@Controller
public class CodeController {
  private int width = 80;
  private int height = 28;
  private int codeCount = 4;
  private int xx = 15;
  private int fontHeight = 18;
  private int codeY = 16;
  char[] codeSequence = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

  @RequestMapping("/code")
  public void getCode(HttpServletRequest req, HttpServletResponse resp)
	  throws IOException {

	// 定义图像buffer
	BufferedImage buffImg = new BufferedImage(width, height,
	    BufferedImage.TYPE_INT_RGB);
	// Graphics2D gd = buffImg.createGraphics();
	// Graphics2D gd = (Graphics2D) buffImg.getGraphics();
	Graphics gd = buffImg.getGraphics();
	// 创建一个随机数生成器类
	Random random = new Random();
	// 将图像填充为白色
	gd.setColor(Color.WHITE);
	gd.fillRect(0, 0, width, height);

	// 创建字体，字体的大小应该根据图片的高度来定。
	Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
	// 设置字体。
	gd.setFont(font);

	// 画边框。
	gd.setColor(Color.BLACK);
	gd.drawRect(0, 0, width - 1, height - 1);

	// 随机产生40条干扰线，使图象中的认证码不易被其它程序探测到。
	gd.setColor(Color.BLACK);
	for (int i = 0; i < 40; i++) {
	  int x = random.nextInt(width);
	  int y = random.nextInt(height);
	  int xl = random.nextInt(12);
	  int yl = random.nextInt(12);
	  gd.drawLine(x, y, x + xl, y + yl);
	}

	// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
	StringBuffer randomCode = new StringBuffer();
	int red = 0, green = 0, blue = 0;

	// 随机产生codeCount数字的验证码。
	for (int i = 0; i < codeCount; i++) {
	  // 得到随机产生的验证码数字。
	  String code = String.valueOf(codeSequence[random.nextInt(10)]);
	  // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。
	  red = random.nextInt(255);
	  green = random.nextInt(255);
	  blue = random.nextInt(255);

	  // 用随机产生的颜色将验证码绘制到图像中。
	  gd.setColor(new Color(red, green, blue));
	  gd.drawString(code, (i + 1) * xx, codeY);

	  // 将产生的四个随机数组合在一起。
	  randomCode.append(code);
	}
	// 将四位数字的验证码保存到Session中。
	HttpSession session = req.getSession();
	System.out.print(randomCode);
	session.setAttribute("iicode", randomCode.toString());

	// 禁止图像缓存。
	resp.setHeader("Pragma", "no-cache");
	resp.setHeader("Cache-Control", "no-cache");
	resp.setDateHeader("Expires", 0);

	resp.setContentType("image/jpeg");

	// 将图像输出到Servlet输出流中。
	ServletOutputStream sos = resp.getOutputStream();
	ImageIO.write(buffImg, "jpeg", sos);
	sos.close();
  }

  @RequestMapping(value = "/reg/checkcode.json", method = RequestMethod.GET)
  public ModelAndView regcheckcode(
	  @RequestParam(value = "code", required = true) String code,
	  HttpServletRequest req) {
	BaseJson base = new BaseJson();
	base.setOk(false);
	HttpSession session = req.getSession();
	if (session != null && session.getAttribute("iicode") != null
	    && session.getAttribute("iicode").toString().equals(code))
	  base.setOk(true);
	ModelAndView mav = new ModelAndView();
	mav.addObject("result", base);
	return mav;
  }
}